<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #app{
            width: 600px;
            margin: 40px auto;
        }
        .outer{
            display: flex;
            margin-bottom: 20px;
        }
        .inner{
            padding: 0 10px;
            text-align: center;
            min-width: 100px;
            border-bottom: 1px solid #000;
            font-weight: bold;
            color: red;
        }
    </style>
</head>
<body>
    <script src="../js/vue.js"></script>
    <div id ="app">
        <div class="outer">今天天气不错，我准备
            <div class="inner">{{activity}}</div>。
        </div>
        <advice @advice="receiveAdvice"></advice>
    </div>
    <script>
        Vue.component('advice',{
            data(){
                return{
                    arr:['打篮球','野炊','游泳','宅在家','复习迎考']
                }
            },
            template:'<button @click="giveAdvice">给出建议</button>',
            methods:{
                giveAdvice:function(){
                    let msg=this.arr[Math.floor(Math.random()*this.arr.length)]
                    this.$emit('advice',msg)
                }
            }
        })
        let app = new Vue({
            el:"#app",
            data:{ 
                activity:''
            },
            methods:{
                receiveAdvice(msg){
                    this.activity=msg
                }
            }
        })
    </script>
</body>
</html>